// Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "paddle/extension.h"
#include <stdio.h>
#include <string.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/types.h>
#include "msg_utils.h"

void GetOutputKVSignal(const paddle::Tensor& x,
                       int64_t rank_id,
                       bool wait_flag) {
  int msg_queue_id = 1024 + rank_id;
  static struct msgdatakv msg_rcv;
  static key_t key = ftok("/opt/", msg_queue_id);
  static int msgid = msgget(key, IPC_CREAT | 0666);

  int* out_data = const_cast<int*>(x.data<int>());
  int ret = -1;
  if (!wait_flag) {
    ret = msgrcv(msgid, &msg_rcv, (MAX_BSZ * 3 + 2) * 4, 0, IPC_NOWAIT);
  } else {
    ret = msgrcv(msgid, &msg_rcv, (MAX_BSZ * 3 + 2) * 4, 0, 0);
  }
  if (ret == -1) {
    out_data[0] = -1;
    out_data[1] = -1;
    return;
  }
  int encoder_count = msg_rcv.mtext[0];

  for (int i = 0; i < encoder_count * 3 + 2; i++) {
    out_data[i] = msg_rcv.mtext[i];
  }
  return;
}

void GetOutput(const paddle::Tensor &x, int64_t rank_id, bool wait_flag,
               int msg_queue_id) {
    if (rank_id > 0) {
        return;
    }
    static struct msgdata msg_rcv;
    if (const char *inference_msg_queue_id_env_p =
            std::getenv("INFERENCE_MSG_QUEUE_ID")) {
        std::string inference_msg_queue_id_env_str(
            inference_msg_queue_id_env_p);
        int inference_msg_queue_id_from_env =
            std::stoi(inference_msg_queue_id_env_str);
#ifdef GET_OUTPUT_DEBUG
        std::cout << "Your INFERENCE_MSG_QUEUE_ID is: "
                  << inference_msg_queue_id_from_env << std::endl;
#endif
        msg_queue_id = inference_msg_queue_id_from_env;
    }
    static key_t key = ftok("/dev/shm", msg_queue_id);
    static int msgid = msgget(key, IPC_CREAT | 0666);

#ifdef GET_OUTPUT_DEBUG
    std::cout << "get_output msg_queue_id: " << msg_queue_id << std::endl;
    std::cout << "get_output key: " << key << std::endl;
    std::cout << "get_output msgid: " << msgid << std::endl;
    std::cout << "get_output wait_flag: " << wait_flag << std::endl;
#endif

    int64_t *out_data = const_cast<int64_t *>(x.data<int64_t>());
    int ret = -1;
    if (!wait_flag) {
        ret = msgrcv(msgid, &msg_rcv, (MAX_BSZ + 2) * 4, 0, IPC_NOWAIT);
    } else {
        ret = msgrcv(msgid, &msg_rcv, (MAX_BSZ + 2) * 4, 0, 0);
    }

#ifdef GET_OUTPUT_DEBUG
    std::cout << "get_output finish msgrcv" << std::endl;
#endif
    if (ret == -1) {
        out_data[0] = -2;
        out_data[1] = 0;
        return;
    }
    int bsz = msg_rcv.mtext[1];

    for (int64_t i = 0; i < bsz + 2; i++) {
        out_data[i] = (int64_t)msg_rcv.mtext[i];
    }
#ifdef GET_OUTPUT_DEBUG
    std::cout << "get_output finished: " << msgid << std::endl;
#endif

    return;
}

void GetOutputStatic(const paddle::Tensor &x, int64_t rank_id, bool wait_flag) {
    GetOutput(x, rank_id, wait_flag, 1);
}

void GetOutputDynamic(const paddle::Tensor &x, int64_t rank_id, bool wait_flag,
                      int msg_queue_id) {
    GetOutput(x, rank_id, wait_flag, msg_queue_id);
}

PD_BUILD_OP(get_output)
    .Inputs({"x"})
    .Attrs({"rank_id: int64_t", "wait_flag: bool"})
    .Outputs({"x_out"})
    .SetInplaceMap({{"x", "x_out"}})
    .SetKernelFn(PD_KERNEL(GetOutputStatic));

PD_BUILD_OP(get_output_dynamic)
    .Inputs({"x"})
    .Attrs({"rank_id: int64_t", "wait_flag: bool", "msg_queue_id: int"})
    .Outputs({"x_out"})
    .SetInplaceMap({{"x", "x_out"}})
    .SetKernelFn(PD_KERNEL(GetOutputDynamic));

PD_BUILD_OP(get_output_ep)
    .Inputs({"x"})
    .Attrs({"rank_id: int64_t", "wait_flag: bool"})
    .Outputs({"x_out"})
    .SetInplaceMap({{"x", "x_out"}})
    .SetKernelFn(PD_KERNEL(GetOutputStatic));

PD_BUILD_OP(get_output_ep_dynamic)
    .Inputs({"x"})
    .Attrs({"rank_id: int64_t", "wait_flag: bool", "msg_queue_id: int"})
    .Outputs({"x_out"})
    .SetInplaceMap({{"x", "x_out"}})
    .SetKernelFn(PD_KERNEL(GetOutputDynamic));
